Colorectal cancer remains one of the leading causes of cancer-related mortality, highlighting the importance of optimizing approaches for its early diagnosis and therapy. One promising area in this field is the investigation of the role of the gut microbiome in the initiation and progression of colorectal cancer. This review examines three principal hypotheses explaining the contribution of microbiota to carcinogenesis: the "Alpha-bug", the "Keystone pathogen", and the "Driver-Passenger" models. We analyze data on the mechanisms of microbiota-tumor cells interactions, including the induction of inflammation, genotoxicity, and disruption of the intestinal barrier function. Findings are also presented indicating that certain microorganisms previously considered markers of the advanced stages may possess pro-oncogenic properties, thereby refining existing carcinogenesis models. Overall, the data suggest that the microbiota and its dysbiotic alterations can be considered potential targets for colorectal cancer diagnosis and therapy.